Fandom

VroniPlag Wiki

Mrs/Fragment 037 13

< Mrs

31.358Seiten in
diesem Wiki
Seite hinzufügen
Diskussion0 Share

Störung durch Adblocker erkannt!


Wikia ist eine gebührenfreie Seite, die sich durch Werbung finanziert. Benutzer, die Adblocker einsetzen, haben eine modifizierte Ansicht der Seite.

Wikia ist nicht verfügbar, wenn du weitere Modifikationen in dem Adblocker-Programm gemacht hast. Wenn du sie entfernst, dann wird die Seite ohne Probleme geladen.


Typus
Verschleierung
Bearbeiter
SleepyHollow02
Gesichtet
Yes.png
Untersuchte Arbeit:
Seite: 37, Zeilen: 13-20
Quelle: Evonik 2009
Seite(n): 4, Zeilen: l.col.: 19 ff.
Siloxane (ºSi-O-Siº) and silanol (ºSi-OH) groups are situated on the surface of fumed silica particles. This latter type (i.e. silanol) of functional groups in particular is responsible for the hydrophilic behavior of non-after treated fumed silica types. Figure 3.4 shows the surface groups of hydrophilic AEROSIL fumed silica. AEROSIL fumed silica can be surface-modified by reacting the silanol groups with suitable compounds such as silanes. For example Aerosil R972, is produced by reacting hydrophilic silica with dimethylchlorosilane as shown in Figure 3.5 .this product exhibits chemically bound dimethyl silyl groups on its surface and can no longer be wetted with water – in other words, it is hydrophobic. Siloxane and silanol groups are situated on the surface of AEROSIL® particles. This latter type of functional group in particular is responsible for the hydrophilic behavior of non-aftertreated AEROSIL® types. Figure 1 shows the surface groups of hydrophilic AEROSIL® fumed silica. For basic details and applications of AEROSIL® fumed silica, see issue number 11 of the pigments publication series [1].

AEROSIL® fumed silica can be surface-modified by reacting the silanol groups with suitable compounds such as silanes. AEROSIL® R 972 is obtained by reaction with dimethyl-dichlorosilane, for example; this product exhibits chemically bound dimethyl silyl groups on its surface and can no longer be wetted with water – in other words, it is hydrophobic.


(1) Technical Bulletin Fine Particles, No. 11, Basic Characteristics of AEROSIL® fumed silica, 6th edition 2003, Degussa AG, D-40402 Düsseldorf, Germany

Anmerkungen

The source is not mentioned.

Sichter
(SleepyHollow02), Hindemith

Auch bei Fandom

Zufälliges Wiki